Improvement in shields for puddling-furnaces



H. McDONALD. l Shield for Puddling Furnaces.

Patented Dec. 29, 18,68.

NITED STATES PATENT OFFICE..

HUGH MCDONALD, OF PITTSBURG, PENNSYLVANIA.

IMPROVEMENT |N sHIE-LDS FOR PuoDLlNG-FURNACES.

Specifica-tion forming part of Letters Patent No. 85,320, dated December 29, 1868.

.To a/ZZ whom it may concern,.-

Be it known that I, HUGH MODONALD, of Pittsburg, in the county of Allegheny and State of Pennsylvania, 4have invented a new and useful Improvement in Shields for Furnaces used in the Manufacture of Iron and Steel; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawt ings, and'to the letters of reference marked thereon.

The nature of my invention consists in providing furnaces used in the manufacture of iron or steel with a shield not attached to the furnace, and so constructed and arranged with relation to the furnace that a body of cold water will be between the Workman andthe furnace, and thereby protect him from the .heat radiating from the heated furnace.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

In the accompanying drawings, which form part of my specilication, Figure 1 is aside elevation of my improved shield for furnaces used in the manufacture of iron or steel. Fig. 2 is a transverse section of the same when cut through at line` y of Fig. 1. Fig. 3 is a top view or plan of the same.

In the drawings, A represents the shield,` which is made ofsheet-iron, and is constructed so as to form a water-chamber, f. The shield A is provided with a sliding door, B, which should be a littlelarger than the charging-door of the puddling, boiling, or heating furnace, and should in forrn resemble the doors of said furnaces.

On the inside Of the door B, at its upper end, is a projecting iiange, e, which is so arranged with relation tO the charging-door of the furnaces that when hoisting said door it will come in contact with the flange e, and thereby raise the door B of the shield. The door B is provided witha pipe, O, for supplying it with cold Water, and should be provided with a suitable waste-pipe. The sides of the door B are made inclined, as shown in Fig.` 3, and the form of the recess in the shield for the door should correspondfto it. By giving the door B and its recess this form, it gives the workman the desired room for manipulating his tools for the proper working of the furnace.

D represents a door, made in the shield opposite to the nre-door of the furnace. This Tdoor should be so arranged as to be supplied with cold water. This can be accomplished with what are known as hollow hinges, Or pipeconnections,such as are used for gas-burn ers. The shield A is provided with a supplypipe, C, and wastepipe G2. The pipe C is connected with the water-reservoir by any known means, and should be provided with a .suitable valve for regulating the flow of water through the shield and its doors. The lower side of the shield is provided with a flange, o,

for. the purpose of forming a base for holding l it steady.

The dotted lines x represent the outline of a furnace, and represent the relation of the shield to the furnace. y

The red and dotted lines y represent the position of the door B when hoisted for charging the furnace or removing the Worked iron from the furnace. l

rPhe advantage of my improved shield for furnaces consists in protecting the workmen from the exhausting, debilitating, and enervating effects of the heat radiated from the v ranged with relation to the furnace that a I body of cold water will be between the workman and the furnace,- as herein described, and for the purpose set forth.

' HUGH MODONALD.

Witnesses:

A. .0. JOHNSTON,

JAMES J. JOHNSTON. 

